2. It is generally easier to change majors within colleges and universities, because the knowledge of many majors is not much different, and the procedures for changing majors are relatively easy. It is difficult to change majors across colleges, and you need to be admitted to the college you want to change. The college you transfer to has to organize exams for basic subjects and professional knowledge, and of course all kinds of procedures are troublesome.
3. It is easy for a popular major to turn into an unpopular major, and the requirements for grades are not so strict. Of course, such students are rare; If an upset becomes a hot spot, there will be great competition, and you must work harder in your studies.